Synthesis of A Novel UV-curable Oligmer 1,4-cyclohexanedimethanol Glycidyl Ether Acrylate and Study on Its UV-curing Properties

A novel UV-curable oligmer 1,4-cyclohexanedimethanol glycidyl ether acrylate（CHDMGEA） was synthesized by utilizing 1,4-cyclohexanedimethanol glycidyl ether（CHDMGE） and acrylic acid（AA） as starting materials, triphenyl phosphine as catalyst and p-hydroxyanisole as inhibitor. The optimum synthetic conditions were that the concentration of triphenyl phosphine was 0.90% of reactants by weight, the concentration of p-hydroxyanisole was 0.20% of reactants by weight, the reaction temperature was 90-100 ℃, and the molar ratio of CHDMGE to AA was 0.5：1.1. The experimental results show that CHDMGEA is a kind of good UV-curable oligmer. The impact resistance of the UV-cured films with CHDMGEA as oligmer to prepare UV-curing coating was superior to that of the UV-cured films with bisphenol A diglycidyl ether diacrylate（BPGEA） as oligmer to prepare UV-curing coating.

Allyl Glycidyl Ether-modified Animal Glue Binder for Improved Water Resistance and Bonding Strength in Sand Casting

This paper aims to develop a modified animal glue sand binder for foundry casting with improved water resistance and bonding strength.An efficient method is reported by using sodium hydroxide as the catalyst to improve the operability of animal glue binder and allyl glycidyl ether as the modifier to improve the water resistance and bonding strength.Sand specimens prepared using allyl glycidyl ether-modified animal glue binder were cured by compressed air at room temperature.The proposed method saves energy and is environmentally friendly and inexpensive.Compared with unmodified animal glue binder,standard dog bone sand specimens with allyl glycidyl ether-modified animal glue binder had higher tensile strength of 2.58 MPa,flowability of 1.95 g,better water resistance(a lower decrease in tensile strength at 25°C and relative humidity of 60%),and good collapsibility.This allyl glycidyl ether-modified animal glue binder is suitable for practical application in the foundry industry.

Formation of Hybrid Ring Structure of Cyanurate/Isocyanurate in the Reaction be-tween 2,4,6-Tris(4-Phenyl-Phenoxy)-1, 3,5-Triazine and Phenyl Glycidyl Ether

Reaction products of 2,4,6-tris(4-phenyl-phenoxy)-1,3,5-triazine derived from 4-phenylphenol cyanate ester and phenyl glycidyl ether were analyzed. In addition to an isocyanurate compound and an oxazolidone compound which were well known as reaction products of cyanate esters and epoxy resins, compounds with hybrid ring structure of cyanurate/isocyanurate were determined. Gibbs free energies of the compound having hybrid ring structure of cyanurate/isocyanurate with two isocyanurate moiety were found to be lower than that of the compound with cyanurate ring structure through calculations. Calculation data supported the existence of hybrid ring structure of cy-anurate/isocyanurate. It was revealed that isomerization from cyanurate to isocyanurate occurs via hybrid ring structure of cyanurate/isocyanurate in the reaction of aryl cyanurate and epoxy.

Synthesis of a Novel UV-Curable Diluent Benzyl Glycidyl Ether Acrylate and Its Application

A novel UV-curable diluent benzyl glycidyl ether acrylate(BGEA) was synthesized by utilizing benzyl glycidyl ether(BGE) and acrylic acid(AA) as starting materials,N,N-dimethylbenzylamine as catalyst and p-hydroxyanisole as inhibitor.The optimum synthetic conditions were that the concentration of N,N-dimethylbenzylamine was 0.90% of reactants by weight,the concentration of p-hydroxyanisole was 0.20% of reactants by weight,the reaction temperature was 90-100℃,and the molar ratio of BGE to AA was 1.00:1.10.The experiment shows that BGEA is a kind of good diluent.The mechanical properties of the UV-cured films with BGEA as diluent to prepare UV-curing coating were superior to that of the UV-cured films with butyl acrylate as diluent to prepare UV-curing coating.

Theoretical Analysis of Mass Transfer with Chemical Reaction Using Absorption of Carbon Dioxide into Phenyl Glycidyl Ether Solution

Theoretical analysis corresponding to the diffusion and reaction kinetics in a chemical reaction between carbon dioxide and phenyl glycidyl ether solution is presented. Analytical expressions pertaining to the concentration of carbon dioxide (CO2), phenyl glycidyl ether solution (PGE) and flux are obtained in terms of reaction rate constants. In this paper, a powerful analytical method, called the Adomian decomposition method (ADM) is used to obtain approximate analytical solutions for nonlinear differential equations. Furthermore, in this work the numerical simulation of the problem is also reported using Scilab/Matlab program. An agreement between analytical and numerical results is noted.

Cellulose Nanofibrous Membranes Modified with Phenyl Glycidyl Ether for Efficient Adsorption of Bovine Serum Albumin

Hydrophobic interaction chromatography(HIC)as an indispensable method for protein purification has attracted considerable attentions of researchers as well as biopharmaceutical industries.However,the low binding capacity and slow adsorption rate of the currently available HIC media lead to a little supply and high price of the highly purified proteins.Herein,nanofibrous membranes with hydrophobic binding sites were developed for HIC by directly coupling phenyl glycidyl ether on the hydrolyzed cellulose acetate nanofiber membrane(cellulose-phenyl NFM).Scanning electron microscope(SEM),water contact angle(WCA),Fourier transform infrared(FTIR),thermogravimetric analysis(TGA),Brunauer-Emmett-Teller(BET)surface area analysis and capillary flow porometer(CFP)were applied to evaluate the physically and chemically structural transformation.The obtained cellulose-phenyl NFMs showed a proper hydrophilcity(WCA=37°),a relatively high BET surface area(3.6 times the surface area of commercial fibrous membranes),and tortuous-channel structure with through-hole size in the range of 0.25-1.2μm,which led to a little non-specificity adsorption,high bovine serum albumin adsorption capacity of 118 mg g^(−1),fast adsorption process within 12 h,good long-term stability and reusability.Moreover,compared with traditional modification methods which always include activation and graft two steps,direct coupling method is more efficient for HIC media fabrication.Therefore,cellulose-phenyl NFMs with outstanding protein adsorption performance could be a kind of promising candidate for HIC.

Using multiple site-directed modification of epoxide hydrolase to significantly improve its enantioselectivity in hydrolysis of rac-glycidyl phenyl ether

The epoxide hydrolase gene(SpEH) from Sphingomonas sp. HXN-200 was synthesized and expressed in robust Escherichia coli cells that had a dual protection system. The enantioselectivity(E-value) of the recombinant SpEH was 7.7 and the yield of the remaining(R)-PGE was 24.3% for the hydrolysis of racemic phenyl glycidyl ether(rac-PGE). To improve the catalytic properties of SpEH, the site-directed mutagenesis was carried out based on homology modeling, sequence alignment and molecular docking. Six residues(V195, V196, F218,N226, Q312, and M332) near the active site were mutated to hydrophobic amino acids and the positive mutations were selected for combinatorial mutation. The optimal mutant SpEH^(V196A/N226A/M332A) had an enhanced E-value of 21.2 and a specific activity of 4.57 U·mg^-1-wet cells, which were 2.8-, and 2.3-fold higher than those of wild-type SpEH. The optimal temperature and p H for purified Sp EHV196 A/N226 A/M332 Ato catalyze the hydrolysis of rac-PGE were 25 ℃ and 7.0 with 200 U·mg^-1. The enantioselectivity and yield of the remaining(R)-PGE of E. coliSpEH^(V196A/N226A/M332A)increased from 7.7 to 21.2 and 24.3% to 40.9%, respectively. The molecular docking and kinetic parameter analyses showed that SpEH^(V196A/N226A/M332A) has a greater affinity toward(S)-PGE than(R)-PGE, and that it was more difficult for the O-atom of ASP170 to achieve the nucleophilic attack on the Cα of(R)-PGE, resulting in its improved enantioselectivity.

Polymers with complicated architectures constructed from the versatile, functional monomer 1-ethoxyethyl glycidyl ether

Because glycidyl(Gly) contains an epoxy and an active hydroxyl group, the Gly unit is difficult to introduce into certain polymeric chains in a controlled manner and usually yields hyperbranched polyglycidyl. Alternatively, the monomer 1-ethoxyethyl glycidyl ether(EEGE), derived from Gly and ethyl vinyl ether, has shown potential for application in polymer chemistry, and homopolymerization of this monomer directly produces linear poly(1-ethoxyethyl glycidyl ether) and further yields linear polyglycidyl. In this review, the initiation system of the EEGE monomer is first discussed in terms of chain transfer to monomers in ring-opening polymerization of epoxides with substituent groups. Then, random copolymerization of EEGE with other epoxides is considered. In addition, because the EEGE units on polymers can be transferred to Gly units and further used to construct copolymers with complicated architectures, the applications of EEGE monomers to block, graft, and hyperbranched copolymers are reviewed. Finally, the synthesis of main chain and terminal functional polyethers by transforming the hydroxyl groups at the polymer end or on the main chain into certain functional groups are also discussed. Chemistry based on EEGE has been proved to be an efficient, versatile route to constructing copolymers containing Gly units and ultimately yielding the target properties and applications.

氟硅缩水甘油醚环氧单体的合成与性能研究

开发可阳离子光聚合的氟硅单体是光聚合领域重要的研究方向。利用易得的原料和简单的工艺合成了一种氟硅缩水甘油醚环氧单体(FSi-GE),采用核磁共振波谱仪(NMR)和傅立叶变换红外光谱仪(FT-IR)对该单体的结构进行了表征,并研究了其对环氧单体3,4-环氧环己基甲基3,4-环氧环己基甲酸酯(E4221)和1,2-环氧−4-乙烯基环己烷(VOH)组成的阳离子光聚合体系的光聚合动力学、表面疏水性、耐热性及拉伸性能的影响。结果表明:当FSi-GE的添加量从0增加到0.5%,体系的环氧基团最终转化率从60.6%上升到65.7%,固化膜表面水接触角从56.9°升至104.6°,断裂伸长率从22.96%升至41.22%,同时耐热性提高。但随着FSi-GE的含量继续增加,表面水接触角、耐热性和断裂伸长率都呈现略微下降的趋势。说明加入适量的FSi-GE能够有效提高E4221/VOH体系的最终转化率、疏水性、耐热性和机械性能。

2—甲苯缩水甘油醚协同提升环氧复合物韧性及刚性研究

电气及电子设备集成度的不断提高,对环氧复合物的热学与力学综合性能提出了更高需求。环氧复合物的耐热性能、刚性与韧性三者之间存在“跷跷板”现象,难以协同提升。该文提出将六氢邻苯二甲酸酐/四氢邻苯二甲酸酐/邻苯二甲酸酐3种固化剂复配提升环氧复合物热学性能,并采用2—甲苯缩水甘油醚协同提升环氧复合物韧性及刚性的方法。研究表明:固化剂复配的方法将环氧复合物的玻璃化转变温度Tg及热分解温度T5%分别提升了17.93%、7.72%;2—甲苯缩水甘油醚改性使得环氧复合物冲击强度和弯曲强度分别提升了123.03%、61.71%。采用分子动力学模拟,从分子角度揭示了2—甲苯缩水甘油醚提升环氧固化物性能的机理,其刚性苯环基团增强了环氧体系分子结构稳定性,柔性—C—O—C—链段改善了交联体系柔韧性。该研究提出一种不降低环氧复合物热学性能,并协同提升其韧性与刚性的可行方法,可为具备高综合热学与力学性能环氧复合物配方的设计提供新思路。

有机硅树枝状表面活性剂的制备及性能

以季戊四醇(PETP)、烯丙基缩水甘油醚(AGE)、七甲基三硅氧烷(MDHM)为原料,通过环氧开环和硅氢加成反应,合成出一种树枝状非离子表面活性剂AGE-PETP-MDHM。通过傅里叶红外光谱仪(FT-IR)对产物进行结构表征,并在25℃下测试产物的表面张力、铺展性能、乳化性能、消抑泡性能、增溶性能及其对聚醚表面活性剂溶液流变性的影响。结果表明:AGE-PETP-MDHM的临界胶束浓度(cmc)为1.08×10^(-4)mol/L,可降低水的最低表面张力至22.67 mN/m,接触角在石蜡表面由53.81°降至43.81°,乳化性能较差,具有不错的消抑泡性能和增溶能力,对聚醚表面活性剂溶液的降黏率可达到35.45%。

糖苷双子非离子表面活性剂的制备及性能

以烷基糖苷为原料,乙二醇二缩水甘油醚、二甘醇二缩水甘油醚为联接基合成出2种不同链长的糖苷双子非离子表面活性剂。通过傅里叶变换红外光谱仪(FT-IR)对产物进行结构表征,并在25℃下对3种物质的表面张力、泡沫、乳化、接触角及增溶等性能进行测试。结果表明:所合成的2种双子表面活性剂的临界胶束浓度(CMC)均比单体低一个数量级,并且具有更好的亲水性、更低的起泡及稳泡性、更强的增溶能力,但乳化能力均弱于单体。所合成的双子表面活性剂的CMC、起泡及稳泡性随联接基链长增长而降低,乳化、亲水及增溶等性能随链长增长而增强。

桐油基缩水甘油醚环氧树脂的合成及性能

以甲醇钠为催化剂,桐油、丙三醇为原料进行酯交换反应生成改性桐油基多元醇.用改性桐油基多元醇部分替代双酚A,在催化剂催化下与环氧氯丙烷反应合成桐油基缩水甘油醚环氧树脂.通过红外光谱和核磁共振氢谱分析桐油基缩水甘油醚环氧树脂性能.结果显示:改性桐油基多元醇经反应成功合成了桐油基缩水甘油醚环氧树脂,最优反应条件为桐油基多元醇替代量20%,n(环氧氯丙烷)∶n(双酚A)为4∶1,NaOH添加量为双酚A质量的40%,反应温度80℃,反应时间7 h,在此条件下合成的桐油基缩水甘油醚环氧树脂胶合强度为0.8038 MPa,环氧值为0.432.

缩水甘油醚型活性稀释剂的合成与应用

缩水甘油醚型活性稀释剂由醇与环氧氯丙烷加成缩合而成。由于醇上取代基的结构多样且活性各异,导致对应的缩水甘油醚合成工艺不同,产品的性能及应用领域不同。不同取代基的缩水甘油醚型活性稀释剂丰富了产品优良的机械、耐化学腐蚀、电绝缘性能。本文系统介绍不同取代基缩水甘油醚型活性稀释剂的合成工艺及对应的性能应用。

阳离子和两性表面活性剂对石英表面润湿性的影响

利用座滴法研究了阳离子表面活性剂十六烷基醚羟丙基季铵盐(C16PC)和两性离子表面活性剂十六烷基醚羟丙基羧酸甜菜碱(C16PB)溶液在石英表面上的润湿性质,考察了表面活性剂类型及浓度对接触角的影响趋势,讨论了黏附张力和黏附功的变化规律.研究发现,两种表面活性剂在高能的石英表面的吸附造成石英-水的界面自由能(γsl)增大.C16PB通过弱相互作用随机吸附到石英表面,其增大γsl的能力与降低表面张力(γ1g)的能力相当,接触角(θ)随浓度变化不大.C16PC随体相浓度增大能够在石英表面通过静电作用形成定向排列的单分子层,而后在临界胶束浓度(cmc)附近形成双层结构,接触角随浓度变化的趋势可分为4个区域,并通过一个极大值.

生物可降解型聚谷氨酸高吸水树脂的制备

以乙二醇缩水甘油醚作为交联剂 ,用化学交联法合成聚谷氨酸高吸水树脂 ,研究了聚合物浓度、交联剂、p H值、反应时间等条件对凝胶吸水性能的影响。结果表明 ,适宜的反应条件为聚谷氨酸 12 % ,交联剂用量为聚谷氨酸量的 18.75 % ,p H5左右 ,4 0℃水浴恒温振荡反应 4 8h,所得树脂的最高吸水率可达 160 0 g/ g。

直链淀粉手性固定相对8种外消旋硫代缩水甘油醚的直接拆分

利用高效液相色谱进行不对称拆分是十分有效的方法，其中多糖类手性固定相是非常重要的一种，它主要包括纤维素和淀粉两大类，Ｏｋａｍｏｔｏ等［１～３］合成了大量的纤维素和直链淀粉的衍生物，并将其涂敷在大孔硅胶表面，从而制备了手性拆分能力较强的多种固定相，这类...

2-羟基-3-丁氧基丙基胍胶的制备及流变性能

以胍胶原粉(GG)为原料,正丁基缩水甘油醚(BGE)为疏水化试剂,氢氧化钠为催化剂,异丙醇为溶剂,制备了2-羟基-3-丁氧基丙基胍胶(HBPG)。通过FT-IR、XRD、TGA对HBPG结构性能进行了表征,并研究了HBPG水溶液和冻胶的流变性能。结果表明,HBPG结构中由于引入疏水基团,使其结晶度下降,热稳定性能提高,HBPG相比GG具有更好的增稠性能,且溶液稳定性能得到明显改善,HBPG制备的冻胶的流变性能优于GG,具有良好的耐温和剪切稳定性能。